it's been 40 years since the apollo program and we have take and step backwards. but i think human nature being what it is, the time will come when people will realize that going to the moon is not enough. going to mars is not enough. we'll have to go someplace where we can move human population at a time when we can't live here on earth anymore. we are maybe talking a million years. but that's okay. in universal time that not very long. alisyn: in the next 40 years so we can get our minds around it. what would you like to see the u.s. set their sights on? >> i would like to see the u.s. set its sights on developing the technology to go wherever we need to go. i would like to see the i.s. set its sights on developing the propulsion system that will take us where we need to go. the first step is go someplace like mars or go to an asteroid. a further step from where wehav. but we need to develop -- the technology development is the key to the whole thing. >> in the special coming up this weekend on fox, we hear astronauts talk about the experience of going to the mo